1 #ifndef __LINUX_GFP_H 2 #define __LINUX_GFP_H 3 4 #include <linux/mmzone.h> 5 #include <linux/stddef.h> 6 #include <linux/linkage.h> 7 8 struct vm_area_struct; 9 10 /* 11 * GFP bitmasks.. 12 * 13 * Zone modifiers (see linux/mmzone.h - low three bits) 14 * 15 * Do not put any conditional on these. If necessary modify the definitions 16 * without the underscores and use the consistently. The definitions here may 17 * be used in bit comparisons. 18 */ 19 #define __GFP_DMA ((__force gfp_t)0x01u) 20 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 21 #define __GFP_DMA32 ((__force gfp_t)0x04u) 22 23 /* 24 * Action modifiers - doesn't change the zoning 25 * 26 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt 27 * _might_ fail. This depends upon the particular VM implementation. 28 * 29 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller 30 * cannot handle allocation failures. 31 * 32 * __GFP_NORETRY: The VM implementation must not retry indefinitely. 33 * 34 * __GFP_MOVABLE: Flag that this page will be movable by the page migration 35 * mechanism or reclaimed 36 */ 37 #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ 38 #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ 39 #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ 40 #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ 41 #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ 42 #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ 43 #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ 44 #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ 45 #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ 46 #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ 47 #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ 48 #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ 49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 50 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ 51 #define __GFP_MOVABLE ((__force gfp_t)0x80000u) /* Page is movable */ 52 53 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ 54 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 55 56 /* if you forget to add the bitmask here kernel will crash, period */ 57 #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ 58 __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ 59 __GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \ 60 __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE| \ 61 __GFP_MOVABLE) 62 63 /* This equals 0, but use constants in case they ever change */ 64 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) 65 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 66 #define GFP_ATOMIC (__GFP_HIGH) 67 #define GFP_NOIO (__GFP_WAIT) 68 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 69 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 70 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 71 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 72 __GFP_HIGHMEM) 73 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 74 __GFP_HARDWALL | __GFP_HIGHMEM | \ 75 __GFP_MOVABLE) 76 #define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE) 77 #define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 78 __GFP_HARDWALL | __GFP_MOVABLE) 79 #define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ 80 __GFP_HARDWALL | __GFP_HIGHMEM | \ 81 __GFP_MOVABLE) 82 83 #ifdef CONFIG_NUMA 84 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) 85 #else 86 #define GFP_THISNODE ((__force gfp_t)0) 87 #endif 88 89 90 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 91 platforms, used as appropriate on others */ 92 93 #define GFP_DMA __GFP_DMA 94 95 /* 4GB DMA on some platforms */ 96 #define GFP_DMA32 __GFP_DMA32 97 98 99 static inline enum zone_type gfp_zone(gfp_t flags) 100 { 101 #ifdef CONFIG_ZONE_DMA 102 if (flags & __GFP_DMA) 103 return ZONE_DMA; 104 #endif 105 #ifdef CONFIG_ZONE_DMA32 106 if (flags & __GFP_DMA32) 107 return ZONE_DMA32; 108 #endif 109 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == 110 (__GFP_HIGHMEM | __GFP_MOVABLE)) 111 return ZONE_MOVABLE; 112 #ifdef CONFIG_HIGHMEM 113 if (flags & __GFP_HIGHMEM) 114 return ZONE_HIGHMEM; 115 #endif 116 return ZONE_NORMAL; 117 } 118 119 /* 120 * There is only one page-allocator function, and two main namespaces to 121 * it. The alloc_page*() variants return 'struct page *' and as such 122 * can allocate highmem pages, the *get*page*() variants return 123 * virtual kernel addresses to the allocated page(s). 124 */ 125 126 /* 127 * We get the zone list from the current node and the gfp_mask. 128 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 129 * 130 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 131 * optimized to &contig_page_data at compile-time. 132 */ 133 134 #ifndef HAVE_ARCH_FREE_PAGE 135 static inline void arch_free_page(struct page *page, int order) { } 136 #endif 137 #ifndef HAVE_ARCH_ALLOC_PAGE 138 static inline void arch_alloc_page(struct page *page, int order) { } 139 #endif 140 141 extern struct page * 142 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); 143 144 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 145 unsigned int order) 146 { 147 if (unlikely(order >= MAX_ORDER)) 148 return NULL; 149 150 /* Unknown node is current node */ 151 if (nid < 0) 152 nid = numa_node_id(); 153 154 return __alloc_pages(gfp_mask, order, 155 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); 156 } 157 158 #ifdef CONFIG_NUMA 159 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 160 161 static inline struct page * 162 alloc_pages(gfp_t gfp_mask, unsigned int order) 163 { 164 if (unlikely(order >= MAX_ORDER)) 165 return NULL; 166 167 return alloc_pages_current(gfp_mask, order); 168 } 169 extern struct page *alloc_page_vma(gfp_t gfp_mask, 170 struct vm_area_struct *vma, unsigned long addr); 171 #else 172 #define alloc_pages(gfp_mask, order) \ 173 alloc_pages_node(numa_node_id(), gfp_mask, order) 174 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 175 #endif 176 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 177 178 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); 179 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); 180 181 #define __get_free_page(gfp_mask) \ 182 __get_free_pages((gfp_mask),0) 183 184 #define __get_dma_pages(gfp_mask, order) \ 185 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 186 187 extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); 188 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); 189 extern void FASTCALL(free_hot_page(struct page *page)); 190 extern void FASTCALL(free_cold_page(struct page *page)); 191 192 #define __free_page(page) __free_pages((page), 0) 193 #define free_page(addr) free_pages((addr),0) 194 195 void page_alloc_init(void); 196 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); 197 198 #endif /* __LINUX_GFP_H */ 199